JPH049927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hydrostatic translational slide with a small bearing surface for supporting heavy loads, in particular for heavy load transport systems with a large number of load plays. Regarding bearings.

BACKGROUND OF THE INVENTION Hydrostatic collar bearings are known which have a rigid construction with a pressure resistance of less than 5 MPa, regardless of whether the internal bearing shoe is articulated as a plate or not. The pressurized medium supplied via the seal that forms flows in the radial direction. The load floats on this hydrostatic bearing with little friction.

Since the structural parts of this bearing deform depending on the load conditions, compatibility is limited. Even articulated ball joints in bearing shoes designed in this way cannot eliminate this drawback. The flexibility of this bearing is not sufficient for variable position conveying systems which require a reduction in structural mass.

The stiffness of this bearing depends on the mechanical behavior of the liquid flow, the mass point distribution and the stiffness of the structural parts.

From DE 2 202 381 A1 a hydrostatic support element is known, in which the oil pocket is an annular support element integrally formed on the circumference of the pocket carrier that acts as a support. The cylinder, which is guided in the cylinder via a ring surface and is releasably connected to a piston with an oil flow hole in the center, with a fine-thread thread on the outer periphery, is screwed into the carrier ring. and can be closed with a flange. The oil pocket can be easily pretensioned against the pocket carrier by means of a drilled screw and by means of the entire elastic intermediate ring.

The disadvantage of this support element is that it only acts as a stationary bearing and cannot be used for translational movements.

Problems to be Solved by the Invention It is an object of the present invention to provide sufficient flexibility of the sealing area to prevent leakage even when the pair of sliding members is elastically deformed while ensuring a large amount of load play. The purpose of the present invention is to create a hydrostatic translational plain bearing with a small bearing surface for the translational movement of heavy objects with low friction.

SUMMARY OF THE INVENTION The object of the invention is to create a hydrostatic translational plain bearing with a small bearing surface for transporting heavy loads, which is suitable for pendulum-like translational movements. The bearing surface is elastically deformable and the bearing is constructed in such a way that it can function even if the seal is tilted.

This problem is solved according to the invention in that the packing ring is fixedly embedded in a carrier ring which is held elastically against the casing by a compression spring and which is pressed uniformly and pretensioned against the sliding surface. This is solved by The carrier ring is mounted movably on the housing in a direction perpendicular to the sliding surface by means of a concentrically arranged closing plate. The carrier ring is surrounded by a sealing ring which is embedded in the casing and is sealed in a liquid-tight and pressure-tight manner with respect to the low-pressure chamber. Inside the housing, a supply line leads from the hydraulic pump to the high-pressure chamber, and from the low-pressure chamber a discharge line leads to the container. The carrier ring is surrounded by a double tongue ring arranged in the housing so as to surround the low pressure chamber at a distance.

The packing ring is reinforced at its lower end.

The lifting height of the carrier ring relative to the casing is equal to the difference between the leg length of the closure plate and the collar width of the inner ring and is greater than the axial deformation of the packing ring under load.

Effects An advantage of the arrangement of the invention is that hydrostatic plain bearings can be used for pendulum-like translational movements. The movability of the carrier ring ensures a flexible response. Irregularities on the sliding surface are balanced without impeding functionality. Due to the extremely high pressure, it is possible to support even large loads on a very small surface.

The collection line ensures constant lubrication of the packing ring.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will now be explained in more detail with reference to embodiments illustrated in the accompanying drawings.

The sealing element that is decisive for the function of the translational plain bearing is the packing ring 1, in particular the radial tongue ring, which is fixedly embedded in the carrier ring 2 and has a reinforced shoulder. The packing ring 1 is pressed against the housing 3 on the one hand by a compression spring 6 and against the sliding surface 7 on the other hand under uniform pretension.

The carrier ring 2 is mounted on the casing 3 so as to be movable in the direction perpendicular to the slideway 7 by means of a concentrically arranged closing plate 8 . In the upper region, the carrier ring 2 is sealed fluid-tightly and pressure-tightly to the low-pressure chamber 12 by a seal 4 surrounding it and embedded in the housing 3.

A supply line 10 is provided in the housing 3, in which the medium is guided from a hydraulic pump to a high-pressure chamber 11. An outlet line 9, which is likewise provided in the housing 3, opens into the low-pressure chamber 12 and supplies leaked medium back to the container.

A carrier ring 2 and a packing ring 5 arranged in the housing 3 at a distance from the carrier ring, for example a double tongue ring resting on the sliding surface 7, surround the low-pressure chamber 12.

The lifting height of the carrier ring 2 relative to the casing 3 is equal to the difference between the leg length 13 of the closing plate 8 and the collar width of the inner ring 14. This lifting height is greater than the axial deformation of the packing ring 1 under load.

During loading, liquid medium is supplied to the high-pressure chamber 11 via the supply line 10. The pressure spring 6 and the internal pressure in the high-pressure chamber 11 press the packing ring 1 against the sliding surface 7, thereby preventing the medium from flowing out, thereby forming a hydrostatic sliding bearing. The deformation of the packing ring 1 is compensated for by the lifting of the carrier ring 2, in which case the rigidity of the sliding surface 7 is also rendered inactive due to the elasticity of the structure.
Leakage liquid flowing out from between the packing ring 1 and the sliding surface 7 is collected in the low pressure chamber 2, but if the amount is large, it is led out through the outlet pipe. The amount of liquid remaining in the low pressure chamber 12 serves to lubricate the packing ring 1 during radial movement of the bearing. The outer tongues of the double tongue ring 5 prevent dirt from entering the bearing.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a translational plain bearing. The symbols in the figure are 1...packing ring, 2...carrying ring, 3...casing, 4...packing ring, 5...double tongue ring, 6...compression spring,
7... Sliding surface, 8... Closing plate, 9... Leading-out conduit,
10... Supply pipeline, 11... High pressure chamber, 12... Low pressure chamber.

Claims (1)

[Claims] 1. In a hydrostatic translational sliding bearing, a packing ring 1 is held elastically in a casing 3 by a compression spring 6 and is uniformly pretensioned and pressed against a sliding surface 7. the carrier ring 2 is fixedly embedded in the carrier ring 2 which is arranged in the casing 3 so as to be movable in the direction perpendicular to the sliding surface 7 by means of a closing plate 8 which is arranged concentrically; that the carrier ring 2 surrounds it and is sealed fluid-tightly and pressure-tightly to the low-pressure chamber 12 by a packing ring 4 embedded in the casing 3; The line 10 is guided from the hydraulic pump to the high-pressure chamber 11 and the outlet line 9 from the low-pressure chamber 12 to the container, and a double tongue in which the packing ring 2 is arranged in the housing 3. A hydrostatic translational sliding bearing characterized in that a ring 5 surrounds a low pressure chamber 12 at intervals. 2. Hydrostatic translational plain bearing according to claim 1, wherein the packing ring 1 is reinforced on its underside. 3 The lifting height of the carrier ring 2 relative to the casing 3 is determined by the leg length 13 of the closing plate 8 and the carrier ring 1.
4. A hydrostatic translational plain bearing according to claim 1, wherein the difference is equal to the height difference between the heights of the inner collars 1 and 4 and greater than the axial deformation of the packing ring 1 under load.